Coupled EnergyPlus and computational fluid dynamics simulation for natural ventilation

Zhang, Rui; Lam, Khee Poh; Yao, Shi‐Chune; Zhang, Yongjie

doi:10.1016/j.buildenv.2013.04.002

Cited by 93 publications

(48 citation statements)

References 14 publications

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“…Overall, one practical solution is to consider steady state transient airflow simulations at different snapshots through time when there are significant changes to the airflow and perform transient energy simulations. Traditionally, coupled or co-simulation of the energy and airflows are performed in indoor spaces [94,[98][99][100][101] that could provide insights for the outdoor coupling energy, radiative, and airflow simulations. Existing outdoor coupling studies have utilized the recommendations for the indoor coupling and co-simulations to pair the energy and airflows in the building environment with the consideration of the intensity required to perform outdoor energy and airflow coupling [102][103][104][105].…”

Section: Overview Of the Energy And Airflow Modeling For Neighborhoodsmentioning

confidence: 99%

“…An example of different time scales in the airflow and energy simulations is the time required for building walls to respond and reach a steady-state condition compared to the air temperature response. While the response time for building walls may take from hours to days, this response time for the surrounding air could be within minutes [93,98]. These different response times suggest that the time steps required to solve the energy and airflow equations differ in their orders of magnitude, suggesting the time step required to solve the transient energy flow is one order of magnitude larger than the airflow simulation time step.…”

mentioning

confidence: 99%

“…Influence of the urban neighborhood on the infiltration rates is also an important variable affecting building energy consumption in neighborhoods due to changes in the local air temperatures and wind speeds [28]. To benefit from the capability of the outdoor CFD simulations, studies have performed co-simulation/coupled studies of outdoor CFD simulations with the multi-zone models in CONTAM [134,135] or airflow networks in EnergyPlus [98]. The pressure coefficient (C p ) is one of the most important parameters that is usually is exchanged between the CFD and the infiltration models.…”

mentioning

confidence: 99%

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Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Srebric

Heidarinejad

Liu

2015

Building and Environment

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Section: Overview Of the Energy And Airflow Modeling For Neighborhoodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Srebric

Heidarinejad

Liu

2015

Building and Environment

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“…However, the accuracy of the CFD model depends greatly on the correct choice of numerical model and efficient discretization of the flow field. There can be considerable difference in heat transfer coefficients between convection correlation and those obtained from CFD as indicated by (Zhai et al 2002;Zhang, Lam, et al 2013). Finding the correct convection heat transfer coefficient by the use of CFD also requires consideration of computational time and cost efficiency.…”

Section: Coupling Building Energy Simulation and Cfdmentioning

confidence: 99%

“…However, the external coupling can either be automatic such as (Fan, Hayashi, and Ito 2012;Zhang, Lam, et al 2013) or manual such as (Barbason and Reiter 2014). Although automatic coupling is preferable, flexibility and the freedom of the user to manipulate the coupling procedure may be restricted.…”

Section: Coupling Building Energy Simulation and Cfdmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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Review of airflow and transport analysis in building using CFD and network model

Kato

2018

Japan Architectural Review

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This paper reviews computational fluid dynamics (CFD) analysis and simulation of a network model of airflow and transport scenarios, as well as their coupled simulation. The network model is a tool to describe the whole and macroscopic characteristics of airflow transport in buildings, where airflow is modeled as a network of one-dimensional flow elements. The flow network model can be solved with comparatively less computational cost; however, all the airflows between nodes should be modeled as one-dimensional. The airflows and their transports in a room are not one-dimensional but three-dimensional. CFD is a convenient tool for analyzing such three-dimensional flows and transports. The equations are non-linear, and their solutions are usually obtained numerically. The CFD analysis requires considerable computation resources and computational time. To analyze the whole and macroscopic characteristics of airflows and their transports in buildings including the space distribution features in a certain room, the two simulations should be carried out simultaneously. In this work, the author reviews the conduction of CFD in a room, network simulation in a whole building, and simulation of their coupling. Further, the author's previous works pertaining to this subject are explained.

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Coupled EnergyPlus and computational fluid dynamics simulation for natural ventilation

Cited by 93 publications

References 14 publications

Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Review of airflow and transport analysis in building using CFD and network model

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